Air-feed control



Aug. 24,1926. 1,597,412

E. B. LEAR AIR FEED CONTROL lij Patented Aug. 24,

onine Svara-s atar orifice.

EARL B. LEAR, GF PHILLIPSBURG, NEI/V JERSEY, ASSIGNORTO INGERSOLL-RANDCOM- PANY, OF JERSEY CITY, NEW JERSEY, V.A CORPORATION OF NEW JERSEY.

.AIR-FEED CONTROL.

This invention relates to fluid actuated rock drills, but moreparticularly to means for controlling the feed element of a stoper typedrill.

The type of drill for which the present invention is contemplated isused chielly forV justed position by mechanical means.

Other objects will be in part obvious and in part pointed outhereinafter.

The invention consists of the combinations of elements, features ofconstruction and arrangement of parts having the general mode ofoperation substantially ashereinafter described and more particularlypointed out in the appended claims and illustrated in the accompanyingdrawings, in which- Figure l is an elevation, partly in section,

of a stoper type rock drill equipped with an drill steel D is supportedby the front head B i and is adapted to receive the blows of the hammerpiston (not shown) reciprocating within the cylinder A.

Drills of the type illustrated in the drawings may be rotated eithermanually or by mechanical means. In this instance 'a motor (not shown)isindicated, and is provided with 'a casing secured [tothe back endvof iits free end extending preferably at right Application led September.18, 1925. Serial No. 57,067.

the cylinder A by bolts F. A head block G forms a closure for the motorand alsoserves as a valve chest for a-suitable throttle valve i i (notshown) whereby the pressure fluid entering the head block from asuitable source of supply-may be admitted to the various pressure fluidactuated elements of the drill. A lever I-I may be provided formanipulating the throttle valve.

In order to advance the drill in accord# ancewith the penetration of thedrill steel D into the work, a feeding element is provided.` The feedingelement in this instance is the element to be controlled and comprises afeed cylinder J secured to thehead block G in any suitable manner andhas al piston K supported by a piston rod L. VThe piston rod L extendsthrough the free end o-f the -cylinder J and carries .a rock engagingpointer O which supports the drill and is.

adapted to penetrate the rock to prevent lateral movement of the drill.

Inorder to prevent rotation of the dril with the drill steel, a handlerP is secured to the head block G and has a projection Q at angles tosaid handle. In the present inw stance the handle P is of sufficientlylarge cross sectional area to enable an oil reservoir It to be formedlongitudinally therethrough. The oil reservoir It is provided with apassage S which preferably communicates with the throttle valve so thatwhen the drill is in operation, a portion ofthe pressure fluid willpulsate into the reservoir and carry the oil in the form of vapor to thevarious.` movable parts of the drill.

In accordance with the practice of the invention, a passage Tcommunicating at its inner end with the cylinder J through a passage Uformed in the head block is formed longitudinally through the handle Pand terminates at its other end at a point near the juncture of thehandle P and the projec-` tion Q. The passage T is constantly incommunication with the feeding cylinder J so that when pressure fluidisadmitted into the feeding cylinder a portion thereof will also pass intothe passageT. Y

In order-to control the outlet end of the passage T a valve chamber V isformed. transversely through the projection Q to 're-- ceive areciprocatory valve W. Inthisiinstance, the valve W isvprovide'd'with aremovable valve head X preferably of'smaller diameter than the 'valve lVWhicliextends hejond'th'e Vali''e cliest V to hear against a face Y of acam Z; The cam 'ZY is preferably.' in theform' 'of a-'collar'and lin toVcooperate with the ends of an tircuatesloti d formed in the cam. y

To thefend'that the carnZ maybe held 'nr adjusted position', series of'teeth e are formed ins 'the 'bore V'of Vthe cam to? cooperate*- 'wi/ithratchet plungerk f sli'dable' in* the* Valve andftlie `valvei c'liest;

so aifiangedwith respect 'to'- each other that be 'oliteinechdepending'upohpthe exteiitof rotation ofY the cam. In thi'sjii'istance aspringf ,arreng'jed Within"4 the Valve V17 and the' atich'et plunger toVcoinstaintlyforce thev'l'v'e" and said ratchet plunger outward: lyjagainst the Caml In' order'to" proyide' for the escape' ofV pressureLfluid" :from the rValve chest Whenever the 'Valute/liv 1s opened, unl

clercutsoi" recesses?? arelformedfin the top and'bottom' faces ofthemmpreferably {id} jacent'thelieadX; Asleeve j forminga gripfor"theoperatfor is-in this'insta'ce sore Yed oii'thelprojection andIformsla bearing for tlie'Ican'i-Zto `prevent endW-ise movement of saidlCami` Anysuitablemeans may loe` proiiid'ed: jfor prev'enting'`unscrewiiig of'thesleeve this linstvance` a'locl Wash"-"erhisinsertedbetween the end 'of the projection Q and a shouldery 0formed inthe"r sleeve y'.

lfv'vduring'the operation ofthe drill, the drill steel D encountersAasoft spoti'n 'the rock,- the feeding pressurey is preferably 're-Aduced topreifentjumpiiig of the 'drilh To so'` reduce the feedingApressure the cam 7 Z" may" loev rocked about" theprojection Q, tolop'en"the Vvalve lV" aiid'allo'ur some' of the' pressure Huid 'tof bleed "fromthe" feeding cylind'er to th'e'at'mosp'here'. :llVhen thee'am Z"V isrocked to one or theotlierof the releas# ing. positions;Y the ratchet'plunger F will -en gagefonefof tli'eteetlr `einj tliefcam' and due to lh'ol'pdtlie cam iii-adjusted ipositionuntil the camjisagain actuated bythe operator.'y

By this" form ofcoiistru'etion the iialiie will A be y.hield i inladjustedl position so` that aunifo'rm" and continuous Vrelease ofpressure fliiidfrom thei4 feeding; cylinder may bey oh-' tained;vfra/desirtiblefeature`in devices ofthisitypeforthe reasolitliatfit is-jextremely difficult for tleoperaft'or to hold* tlfie* releasing 'ldeificin one' I particular positio "ovin'gto Ath duiljiifg th operation ofthe? dri-ll.

The Vtest-li 'e are holding seid vcam in adjusted position.

2i lnI a: rock` drill the combination' -uiitli an elementtofljecontrolle'df, of#` a handle heving a projection at an angletherefrom, a passegethrouglit the' handle leading from 'the element' tfoAloef controlled' tofthe projection, al alre slidfabletrafrisierselyythrough thel projectioiiAiv to'`v ccm'trolli the passfge* for!regulating-' the eXhaust4 of* pressureA fluid'` from' 'the "element to'be controlled, an osoi-llat'ory cam` in the form of aisleev'e eneirclithe; peripheryY of the' projection for! open ng? the" value;Aratohette'tlr on said-foam, andl a'V ratchetpliing'er sli'dable inl thelvallee* toi co` operate with the rteeth for holdiiigthe: cani" in' adjusted -p )'"'sitio`n.l

3;?lna`4 rock drilltheeombination `r`with a'n elemt-m'ttof'be`controlled,V of al'liandle having a' projection at anangletherefromga'fpas'- sage through thehandle-leading frointheelei'nent te'lo'e controlled toi theprojection, a valve slidabletransversely through'the' prol jection to control 1 the p assageE for?regulating tli'e' exl-'iaust ofpr'e'ssure'l fluifdfromf the elel' e menttof be controlled, a removablel head irlsalifdifa'l'e?, anoscillatory'icam 'inf the formi of a sleeveeneircling the projection,and slid# able 'onfsthesaid li'flve head for opening the Vlve-,-ratchetteeth carried the cam, al ratchet plunger slidable in the Valve'to co-yoperate 'with the teethA for holding` the cam iii'yadjustedposition,'-andf-a spring .intlie Valvex Vand' the ratelietplunger for holding ,said valve and ratchet plunger ini constantVContactV with the cainf y y 42.1 In a rock' drill thecombinationiWithelement to 'ibecofit'iolle d, of A afh-anld'le havingy aprojection at an angle therefrom, a passagejthfrugl'the handle leadingfrom the element to 'bef controlled to` the projection, a value1slidalile 'transversely throughl the' pro jection t0 controltliepasselgefor regulating v the' eX'h'a'uet vof p're'issu'i'e2 fluidfrom'theel'ement to loe controlled, a removable headinfj sai-d` valvegoscillatory canifin theI form off aisleeve encirclingtheVl proj'ectioiliand slidL adeley on "thesaid' valve head-'fforopeilingl tlefv valve,`Izat'c`l`iet teeth f carried by `th'e`ci?n, a5 rtchetpl-uii'gersli'dable iny the= valw're' to"coop' crate with theteethforih'o'leliri'ggj'the cam-ii'i' adljuste'dlpositi'oii; a'spri'nfg iii tpreventing endwise movement of the cani.

5. In a rock drill the combination With an element to be controlled, ofa handle having a projection at an angle therefrom, a passage leadingfrom the element to he controlled to the projection, a valve slidabletransversely through the projection controlling the passage forregulating the exhaust of pressure iuid from the element to becontrolled, a removable head in said valve, an oscillatory cam in theform of a sleeve encircling the projection and slidable on the saidvalve head for opening the valve, a lever on said cani, ratchet teethcarried by the cam, a ratchet plunger slidalole yin the valve tocooperate With the teeth for holding the cam in adjusted position, aspring in the valve and the ratchet plunger for holding said valve andratchet plunger in constant Contact with the cam, and a grip screwed onthe projection for manipulating the handle and for preventing end wisemovement of the cam.

In testimony whereof I have signed this specification.

EARL B. LEAR.

